Agent

The agent is a software that acts upon actuation.
The actions of the agent have an effect on the environment.
The agent perceives the environment through sensors.

An agent could be viewed as a function that takes the perceived universe P and the universe of actions A.
With function agent, P partially determines A.
Partially because the agent can potentially ignore part of P.
P should be a sequence of perceptions. We map it to one action at a time.
TODO: Rewrite with formula.

Good behavior

Consequentialism: Evaluation based on consequences.
Performance measure: Notion of desirability.
Reward: +1 point for ...

We should design the performance based on how well the model performs, not on how we think hit should achieve the result.

For each possible percept sequence, a rational agent should select an action that is expected to maximise its performance measure.

Ingredients

Performance measure: measure of how well the model is performing
Environment
Actuators: Conditions that make the agent act. Real???
Sensors: Component that enables the agent to perceive the environment.

Rationality

Ingredients:

Performance measure
Agent's prior knowledge of the environment
Actions the agent can perform
Agent's percept sequence to date

Rationality is not omniscience tho, we are learning to extend prior knowledge, or else the agent would lack autonomy???

Reflex Agent:

if status == Dorty:
	return Suck
else if location == A
	return Right
else if status == B
	return Left

Model-based reflex agent:

It requires a transition model and a sensor model. Idk man...

Goal-based and utility-based agents:

Goal based:

Keeps track of the world state and a set of goals that it's trying to achieve. Then it chooses an action that will eventually lead to the achievement of its goals.
This is done by basically understanding what its action do, predicting the outcome of the action and then actually acting on it to achieve the goal.
Utility based:

To avoid conflicting goals, we have a performance measure based on utility. It will choose the action that is expected to have the best utility.

Learning agent:

The system adapts to the environment. There is a performance assessment to know if the learning is working or not, the learning agent actually changes the performance agent to try and improve its performance.

World state representation

Atomic representation: Indivisibile states, automata-like.
Factored representation: Set of attributes, such as coordinates or scalar values.
Structured representation: Relations between concepts, objects, relational databases. (ex. if we want every car in the room to be black)